Tool holder



T. B. TIEFENBACHER 2,035,999

TOOL HOLDER Filed Nov. 1o', 1934 J6 Z6 J4 Z f5' 2./ V0 y? Z6 jg f? j f?L LL 0' I n n-" \?5' T INVENTOR Z/ @ow'zymamef BY @am MM/Mae v mi [7ATTORNEYS Patented Mar. 31, 1936 STATES PATENT OFFICE 2 Claims.

I .The present invention relates to a tool holder such as may be used ina lathe for supporting a boring tool or a turning tool, and is animprovement on the general type of tool holder described and claimed inmy prior Patent No. 1,647,590.

vIn this type of tool holder there is provided a tool carriage movablealong a trackway, and car- Tying a tool support movable along aninclined guideway formed in said carriage, whereby the height of theoperating end of the tool may be varied by sliding the tool support inselective posi-'- tions. Also, in such a construction, the carriage ispivotally mounted so that it may be swiveled with respect to thetrackway.

In my prior construction, there is provided means for clamping thecarriage in adjusted position along the trackway, and separate andindependent means for clamping the tool support in selective position onthe carriage.

One object of the present invention is to provide simpliiied means forclamping the carriage and the tool support in selective positions.

As a feature of the present invention, I provide a single means forclamping both the carriage upon its trackway or bed plate, and the toolsupport on said carriage. By this arrangement, I am able to effect theclamping of these two members in adjusted position by a single manualoperation.

In the specic embodiment of the invention, I provide a bolt whichextends from the bed plate through the carriage and substantially acrossthe entire height of said carriage, and which is provided at its upperend with means for clamping the carriage and the tool support downwardlyin adjusted position. By having the clamping means on the top of thecarriage rather than on the base portion of the carriage, the bolt maybe positioned closer to the main body of the carriage, so that a moreeiective clamping action is effected. Furthermore, the clamping of thecarriage and the tool support may be effected by a single manualoperation,

In the accompanying drawing, there is shown for the purpose ofillustration, one form of device embodying the present invention. In thedrawing:-

Fig. 1 is a front view of a tool holder embodying the present invention,

Figs. 2 and 3 are sections taken on the line 2-2 and 3-3, respectively,of Fig. l,

Fig. 4 is a rear view of a tool holder embodying the present invention,and

Fig. 5 is a top plan View of a tool holder embodying the presentinvention.

In the specic embodiment of the invention shown, there is provided abase or bed plate IEI forming a trackway for a tool carriage II. Thistool carriage is provided'with a base ange I2 adapted to ride over thebed plate I0, and has an inclined slot I3 on one side thereof forming aguideway for a tool support I4. The base portion of the slot I3 isV-shaped as shown, to form a rail for the tool support I4, the loweredge of this tool support I4 being correspondingly V-shaped to t intothe base portion of said slot, and to ride over said rail.

The upper portion of the slot I3 is also V-shaped to receive thecorrespondingly shaped upper edge of the tool support I4. By means ofthis arrangement, the tool support I4 may be easily moved along theinclined guideway I3 while being held againstv transverse movement withrespect to the tool carriage. If desired, the inner side of the toolsupport I4 may be provided with a ledge I5, the surface of which may bemachined to contact with a corresponding machined surface I6 on the sideof the tool carriage I I.

The tool support I4 is provided on the outer side thereof with ahorizontally extending tool seat member I9 having a V-shaped tool seat20 for receiving a suitable tool 2l, such as a boring or turning tool.By means of this arrangement, the height of the operating end of thetool 2| may be moved into selective position merely by moving the toolsupport I4 along the inclined guideway I3. The tool 2| may be clamped inposition in the tool seat I9 by means of a pair of set screws I'Iadapted to impinge on the tool 2I and threaded into a pair of ears I8extending outwardly from the outer side of the tool support I4.

The carriage II may be translated along the bed plate or trackway I0,and may be swiveled about a vertical axis. For that purpose, there isprovided a bolt 22 having a rectangular head 23 at the lower end thereofextending into the base portion of a T-shaped guide slot 24 formed inthe bed plate I0. This bolt extends through the base flange I2 on thetool carriage, and through an ear 25 disposed in the upper portion ofthe tool carriage. The bolt 22 is disposed very close to the mainportion of the tool carriage II. For that purpose, one side of the toolcarriage is formed with a vertical groove 26 for receiving a portion ofthe bolt. struction, the carriage I I may be translated along thetrackway I0, and may be revolved about the bolt 22 into any selectiveangular position with respect to the axis of said bolt in accordancewith the desired position of the tool 2|. I

By means of this conf As an important feature of the present invention,single means are provided for clamping the carriage II and the toolsupport I4 in selective positions. For that purpose, there is provided aclamping lug 21 loosely embracing the upper portion of the bolt 22 andformed on one side with a downwardly facing Wedge surface 28 seated uponan upwardly facing inclined surface on the ear 25. The other side ofthis clamping lug 21 extends through a cut out portion of the toolcarriage I I, and presents a downwardly facing V-shaped groove 29adapted to seat upon the upper V-shaped portion of the tool support I4.

The lug 21 is clamped in position by means of a nut 3B threaded on tothe upper end of the bolt 22. The lug 21 is preferably provided with asphericallyrcurved nut seat 3I, the lower end of the nut 3l) beingcorrespondingly curved so that a continuous surface contact is assuredbetween the nut and the lug. The lower end of the nut 30 may be in theform of Aa washer 32 welded or otherwise secured to the main portion ofthe nut. By means of this construction, after the carriage I has beentranslated and rotated into any selective vposition on the trackway I0,and after the tool support I4 has been moved along its guideway to thedesired position, the clamping of said tool carriage and said toolsupport is effected by the simple operation of tightening up the nut 30.This causes the clamping lugv 21 to be jammed downwardly against theupper V- shaped edge of the tool support I4, and the wedge surface ofthe ear 25, thereby clamping the'carriage and the tool support inadjusted position.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is: y

l. A tool holder comprising a tool carriage, a

trackway for said tool carriage having a guide slot therein, saidcarriage presenting an inclined guideway, a tool support in saidguideway, a. bolt extending vertically through said tool support andhaving a head at the lower end thereof for movement along said guideslot, a clamping lug loosely embracing said bolt near the upper endthereof, and having a pair of clamping surfaces engaging the toolcarriage and the tool support respectively, and a. nut threaded on saidbolt for forcing said clamping lug against said carriage and said toolsupport for clamping said carriage and said tool support in adjustedpositions.

2. A tool holder including a tool carriage presenting an upwardly facinginclined surface at. the upper end thereof, a bed plate forming aAtraclrway for said tool carriage and having a guide slot for said toolcarriage, said tool carriage being provided with an inclined slot form-'L ing a guideway, a tool support in said guideway, a vertical bolthaving a head at the lower end thereof extending into said guide slotfor guiding said tool carriage along said bed'plate, and

passing loosely through said tool carriage, whereby said carriage may beswiveled about said bolt, a clamping lug near the upper end of saidbolt, presenting a downwardly facing wedge surface adapted to seat uponsaid inclined surface on said tool carriage, and having a downwardly;l

facing clamping surface adapted to seat upon the upper edge of said toolsupport, and a nut threaded onto the upper end of said bolt for forcingsaid clamping lug against said tool support and said carriage forclamping said latter members in adjusted positions.

THOMAS B. TIEFENBACHER.

